63 citations · 313 across the 21 of their papers we have counts for
22 papers
Gravitational multipoles, antipodal matching relations, and the logarithmic soft graviton theorem
Geoffrey Compère, Dima Fontaine, Wen-Bin Liu +1
We derive the classical logarithmic soft graviton theorem for the scattering of massive particles in four-dimensional asymptotically flat spacetime using a position-space analysis…
Electromagnetic multipole expansions and the logarithmic soft photon theorem
Geoffrey Compère, Dima Fontaine, Kevin Nguyen
We study the general structure of the electromagnetic field in the vicinity of spatial infinity. Starting from the general solution of the sourced Maxwell equations written in term…
Celestial soft dressings from generalised Wilson lines
Kevin Nguyen, Alan Rios Fukelman, Chris D. White
In this review article, we revisit the connection between dressing of scattering states in quantum electrodynamics by clouds of soft photons, and their dressing by (generalised) Wi…
Carrollian conformal fields and flat holography
Kevin Nguyen, Peter West
The null conformal boundary of Minkowski spacetime plays a special role in scattering theory, as it is the locus where massless particle states are most…
Virasoro blocks and the reparametrization formalism
Kevin Nguyen
An effective theory designed to compute Virasoro identity blocks at large central charge, expressed in terms of the propagation of a reparametrization/shadow mode between bilocal v…
Geometric action for extended Bondi-Metzner-Sachs group in four dimensions
Glenn Barnich, Kevin Nguyen, Romain Ruzziconi
The constrained Hamiltonian analysis of geometric actions is worked out before applying the construction to the extended Bondi-Metzner-Sachs group in four dimensions. For any Hamil…
Universal derivation of the asymptotic charges of bosonic massless particles
Kevin Nguyen, Peter West
We present a unified treatment of the conserved asymptotic charges associated with any bosonic massless particle in any spacetime dimension. In particular we provide master formula…
Conserved asymptotic charges for any massless particle
Kevin Nguyen, Peter West
We compute the conserved charges associated with the asymptotic symmetries of massless particles by examining their free theory in Minkowski spacetime. We give a procedure to syste…
Loop-corrected subleading soft theorem and the celestial stress-tensor
Laura Donnay, Kevin Nguyen, Romain Ruzziconi
We demonstrate that the one-loop exact subleading soft graviton theorem automatically follows from conservation of the BMS charges, provided that the hard and soft fluxes separatel…
Charge and Antipodal Matching across Spatial Infinity
Federico Capone, Kevin Nguyen, Enrico Parisini
We derive the antipodal matching relations used to demonstrate the equivalence between soft graviton theorems and BMS charge conservation across spatial infinity. To this end we pr…
Schwarzian transformations at null infinity
Kevin Nguyen
I describe the Schwarzian behavior of the gravitational field at null infinity under superrotations, to be understood as an \textit{unobservable} gauge artifact. To this end I revi…
Holographic boundary actions in AdS/CFT revisited
Kevin Nguyen
The generating functional of stress tensor correlation functions in two-dimensional conformal field theory is the nonlocal Polyakov action, or equivalently, the Liouville or Alekse…
Celestial IR divergences and the effective action of supertranslation modes
Kevin Nguyen, Jakob Salzer
Infrared divergences in perturbative gravitational scattering amplitudes have been recently argued to be governed by the two-point function of the supertranslation Goldstone mode o…
Reparametrization modes in 2d CFT and the effective theory of stress tensor exchanges
Kevin Nguyen
We study the origin of the recently proposed effective theory of stress tensor exchanges based on reparametrization modes, that has been used to efficiently compute Virasoro identi…
Robustness of the Cosmological Constant Damping Mechanism Through Matter Eras
Oleg Evnin, Victor Massart, Kevin Nguyen
A dynamical resolution to the cosmological constant fine-tuning problem has been previously put forward, based on a scalar-tensor gravitational theory possessing de Sitter attracto…
Slow scrambling in extremal BTZ and microstate geometries
Ben Craps, Marine De Clerck, Philip Hacker +2
Out-of-time-order correlators (OTOCs) that capture maximally chaotic properties of a black hole are determined by scattering processes near the horizon. This prompts the question t…
The Effective Action of Superrotation Modes
Kévin Nguyen, Jakob Salzer
Starting from an analysis of four-dimensional asymptotically flat gravity in first order formulation, we show that superrotation reparametrization modes are governed by an Alekseev…
Superluminal chaos after a quantum quench
Vijay Balasubramanian, Ben Craps, Marine De Clerck +1
Thermal states holographically dual to black holes in Einstein gravity display maximal Lyapunov growth as well as "butterfly effect cones". We study these effects in highly non-equ…
A Graceful Exit for the Cosmological Constant Damping Scenario
Oleg Evnin, Kévin Nguyen
We present a broad and simple class of scalar-tensor scenarios that successfully realize dynamical damping of the effective cosmological constant, therefore providing a viable dyna…
De Sitter-invariant States from Holography
Kévin Nguyen
A class of invariant states under de Sitter isometries is constructed in d-dimensional Conformal Field Theories from the universal sector of AdS/CFT dualities. These states extend…
Matrix Thermalization
Ben Craps, Oleg Evnin, Kévin Nguyen
Matrix quantum mechanics offers an attractive environment for discussing gravitational holography, in which both sides of the holographic duality are well-defined. Similarly to hig…
The Yukawa Coupling in Three Dimensions
F. A. Dilkes, D. G. C. McKeon, K. Nguyen
We consider several renormalizable, scale free models in three space-time dimensions which involve scalar and spinor fields. The Yukawa couplings are bilinear in both the spinor an…